Electroless Synthesis of Highly Stable and Free-Standing Porous Pt Nanotube Networks and their Application in Methanol Oxidation
Electroless Synthesis of Highly Stable and Free-Standing Porous Pt Nanotube Networks and their Application in Methanol Oxidation
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DOI：
10.1002/celc.201701271
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发表时间：
2018-04
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影响因子：
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通讯作者：
Torsten Walbert;M. Antoni;F. Muench;Th Späth;W. Ensinger
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文献类型：
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作者：
Torsten Walbert;M. Antoni;F. Muench;Th Späth;W. Ensinger
独立的3D金属纳米结构代表着一类即将到来的燃料电池技术电催化剂，它将高老化稳定性和活性与高效的金属利用结合在一起，同时避免使用聚合物粘结剂等添加剂。到目前为止，大多数制造路线都很复杂，会产生无序的纳米结构。在这里，我们提出了一种高度可调的湿化学合成路线，以实现有序、薄壁的铂纳米管网络。该方法包括优化的化学镀工艺，并通过使用离子径迹蚀刻聚碳酸酯模板来轻松调节结构参数(即纳米管直径、壁厚、密度)。与单独的纳米管相比，所得到的纳米网络显示出独立和坚固的框架，这对于在各种电化学和催化应用中使用是一个巨大的优势。甲醇氧化反应的循环伏安研究表明，与商业上可获得的铂纳米颗粒相比，其电催化活性更强。纳米网络具有优异的长寿命稳定性，在1000次循环后的初始活性表面积高达97%，这使其在不同的应用领域具有广阔的应用前景，例如在直接甲醇燃料电池中。
Free‐standing 3D metal nanostructures represent an upcoming class of electrocatalysts for fuel cell technology, combining high aging stability and activity with efficient metal utilization while abstaining from additives such as polymer binders. Until now, most fabrication routes are complex and produce disordered nanostructures. Here, we present a highly adjustable, wet‐chemical synthesis route toward ordered, thin‐walled Pt nanotube networks. The approach includes an optimized electroless plating procedure and enables easy regulation of structural parameters (i. e. nanotube diameter, wall thickness, density) by using ion track‐etched polycarbonate templates. In comparison to individual nanotubes, the resulting nanonetworks exhibit a free‐standing and robust frame, which is a great advantage for use in various electrochemical and catalytic applications. Cyclic voltammetry studies of the methanol oxidation reaction demonstrate enhanced electrocatalytic activity compared to commercially available Pt nanoparticles. The nanonetworks provide outstanding long‐life stability with up to 97 % of the initial active surface area after 1000 cycles, which makes them a promising material in different application fields, for example, in direct methanol fuel cells.